Here, levels 11, 12 and 13 were all done in the same session, with no upload in between.
Same goes for 14, 15, 16 and 17..

It would be nice, if the addon could trace all the levels and list them seperately.
For levels 14-17, it's even possible that they weren't obtained the same day, as there are 5 days between level 13 and 17..